I've got a server running 6.5 sp7 I created mirrors to move data to a new hard drive, removed the old drives, then deleted the old mirror segments using nssmu. I have now added a 2nd new drive where I have expanded the Sys pool onto as a mirror - that went just fine. Now I have two traditional partitions each containing a stripe of Vol1, Vol2 and Vol3 but when I try to expand the first partition to the new drive I get the following error:

525 Unable to add mirror partition to the group <press enter to continue>

and, of course, it doesn't create the mirror on the new drive.....

Anyone have any ideas on why this is happening?